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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071d06f1e36360303d31ba0ccd7171c4c624bb3e2fbfe0bfa4aff9a7079e4b92' 
  AND token = '3J8LwCWJWIuW0Kv33lq7NB6vtGbA/jcgWpKYI2gdpDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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