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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73c99b0073cd30948291689d07bd7d17b618617735a0132f69b6016b0256151' 
  AND token = '5m7nfA/iJOekGRwKb7aA8tNnnhB20O/VWONQFtniEhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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