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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6c733c139b0d9b053677c0b46e2f1d9f9dfe6a52aa3b28526897e89ca513c8' 
  AND token = '9L0Okl0m2oRMk4n0r0NgLr1/4geXHqQ+CA8sR9EMnAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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