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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4465c8717db72c919fd153be6d1af030a029c530bb0f463d8af6af59811e4d9d' 
  AND token = 'kRMf422i6ypOJVS7VubUbTysOSZy+w3txhxT5oRhm2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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