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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a332469f3cb0cb2f54f2d8080a294c671bb38ad800c06246b16a91c3bca4ad' 
  AND token = 'KTQmR+6bF394u95wp20R3sQ0DlDVLwCoXsaSXPKQLBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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