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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fbf44a4bec4310c26055923265b4d5705dc7e35b79c6f02e0aa3b92000dd88' 
  AND token = 'PIXZo03Hc/lKMW7c3h7KJ6UKiSrUE168cKnM67PNU+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}