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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf3d6fcb640163d832a85ed4721e3fb3a73101d4b0c03f83f16150ab324d283' 
  AND token = 'gNG4Hy+A85apaTiEQmd1X1xAXxFox9cZZVQ0L66iNAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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