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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ebf3ab34db67b7232643520c8c35afba1a5403a9da0ec08ddd1de87788ccc3' 
  AND token = '8+LBeDwDH3zdw6yUyhkp4rtGyc4eGFvVttdFtMVy9DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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