SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69367bd5fe7994a1682b6c5cf9d3eebab51ce8f56d4207e46f5fdad265f433e0' 
  AND token = 'SMPg7e3FHvaBIRCEQL9sJzdm/bTJ2w6w568V+uS7HzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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