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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf288f8bf0e20255ca38eeeef03e7d70cd3d21f89446c0ebd3c420559e6bd491' 
  AND token = 'r42R41pTtNSkIH6L88CRWqH3V4P50HfKvbEoR7ZQXB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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