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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7404d5c12eab2d3724bcdb3eded2c53f17f2d67835f6e83d897fa4625f5ebf5' 
  AND token = 'AvP5cSjo9IJPtA27Mf/lgQKN/1sqTlcOw3A6jjY8w1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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