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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059a72acf638d3cb10d3c99f0cadeb3f0a5195b913d29450797ea017d648d639' 
  AND token = 'Nb9Dimv/jJQFAQ/zoX9/ZjWK1n9dmjOpNoJuKVx50o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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