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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31be8db20e1d6c8d34ed7887f88728a7ddd2d1f42c41e94fb3b781cb45d23bb3' 
  AND token = 'r4gM5PfuyKevh8se5jNLgSMYPl0Cl6OdklfYu1nqLko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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