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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc2cbfd76d395490e8f0f80413291d5984c5327d6a9a2e28331eef0b8196c57' 
  AND token = 'O9bgmiMK4HawDuwypyl8AQtuIhn12+p+peiEm1SXiJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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