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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f592d25cacaa1ca8c5ba98a5d5cbc9a62f3f87624adaca61ba95885a02571919' 
  AND token = '2qN4WPT5yUTaTUf8mJqRXxlIWSAARyFjXFXP7xRk4ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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