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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a182b36c48cece00f4a0dbe4fca1fe3b3c28230a43b6fff5ec496733a81ae75b' 
  AND token = 'YxKwtsVyhmBQpVzwPuHH6eMdfgfKIYmI4cnz2BxbcGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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