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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d41fae7c2d55fc4428543c40a8fd59d99347f3a5aa530d4044bed28c88860e' 
  AND token = 'x15FehpBBL6MVV2jdhp+Xe4V3iPet6F2tQyHTuM7nm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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