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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ec2f051303ce5006796ddbbe6eae0dc8261fe3084177cb87326b5cdc4a65f1' 
  AND token = 'Mwxw0clo535zmqSfWG/92e+mO5UBi4EiFe5k6LsZ6Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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