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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cafc5bba5d254704a3d5669afd2b3de5a743a90e911d0df6a92de11dc893b10' 
  AND token = 'QEUcx6avtTG2Oj5et6ni+pJ3xgj/bAxNZVXG0E+22Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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