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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a73c9f5f39efda71585cc756f7bec9e541bde94b9afc2d38c3b1e2eb42ca764' 
  AND token = '2wgGAUhgwgMTdyyISw3N5TMtUvpBgE8PLc3L2LhgRxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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