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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c2584622055241028638f2bcb12a50e1b40da438d20ebe5cd69c1799dfd77c' 
  AND token = 'iU6lJrvGPhyCN8UKAH1vXUR69cqte7Zl9pOeesh7ASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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