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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe0bfff075d5d98c502fa8b56f7ccac62f542885f8dc63fdf4a3ea15e3aedc8' 
  AND token = 'zwJAalO4AD8gRGO++a6iLhsCbhEC/J1xTcMeGdHgup8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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