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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf60018622368f54f10cef2a86b646504c12015c5da677f9b82c9271183120' 
  AND token = '703kCyxbLbZAg5qd1lxNFYxJL4amQ6jGUpsRHTi5wBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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