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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66fcdac59128d21838898fc6f8d059c150e9e28b1b438e9cf823bb8e532159d' 
  AND token = 'H75RF7YnMsnpLSxWEJyDIAsxUM3OjHYHORSYAkkzURI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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