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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d41a46069919577ebb17b13606a54bc72a33f0c5a1ad9d728fdde978b3779f9' 
  AND token = '//C9joLum2jph33jMLPTPfz3xoHt3sIwhL/L8wEvGz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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