SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09449f9fd9f5cf99c49699ad314df56f6e83eb80d4c81252ea8f7ca67dac1d0b' 
  AND token = 'KQm8A/VDSX6wK/lpQCwLJ1V25xlkJG2t6UOXZzlAva4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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