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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5479a60c23bd8a464a13461c3a16da6e3bbe4e89f97facde35fc4786515b63fe' 
  AND token = 'wsO7e1bMsM2cfulI4M2h8TWPHJUMPwi9yPeSaDfvG18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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