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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f9764275edecc3e6a08f0c0fbb3c0b1617d2f6862fc82fd8878ddde846b59e' 
  AND token = 'HjW8BqvvoVUyj3TmodWXfTTz9QwutI9/2T9qGwEii7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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