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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db2266dd04c37833047d0a4c604848221bf44d987a9ac7245773db8b9db52b8' 
  AND token = 'ysp9XQA0LBWsOFcr7MxRGFQOG0mknT0yxYOl10+jF48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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