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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cf6a3edc5fc7bfabeea1258bc3f9c0da85a759c32c6d03dda0530ced93bc84' 
  AND token = 'BTVTqNT1RHl4cWMD4EEkKBysYfnJ5Tv8Wf07kogDLSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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