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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220ad7a87a73061b53f3e95e5b18bef4595d908ca6721aaeeab6ed7a7b1874ea' 
  AND token = 'WMNsKxi8FcM37DGdnWtDQSUq3aVKWipmPL9xi2du8lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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