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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc0385b3d7e40323f5d543d3354b7b393cd138e20210f718cd075135c5b4ea9' 
  AND token = 'XnjLjIdMTFRztla/33jIapGp+ZAquo13vJjHtxaAf8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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