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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3435ca210f3c8550ffac3e8e0a368d3baab1e12c720f9b8b6846533f1230ef3' 
  AND token = 'Dr8WEwkqjqVGKwX5M4Y8y3qtLrzlP25E0bu9waZ/xAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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