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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c179b5b3f2721f4fe5ea6d0ff16e154bb1b0b5bff984498b7c200efda545835' 
  AND token = '6dwrRZ4QjebVfNSK6p7vjF5o6lQHyIM/OHCoikwJkGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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