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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49496eb663e4318944f0ba09384ea0cdbe78f84ce45f6ec6380273f743afee4f' 
  AND token = 'cHAWanDZbI8h4HXyA8Im8j2QD67d0mP5oPvedpRCbzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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