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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a2b5ed366ba0a9ff1ab2f50d58a35634a455aa78eb8ae0ba6499ca7f1fc8cb' 
  AND token = 'vrV/PPxS5RqkrGlnn73CgGO8KvfiEQC43IWRG/jEyTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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