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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a2e94003dccdd2305919875ce9b67e867cb1e53b0f4d52af96da3c7c4c191e' 
  AND token = '3M3vTxSqZWzSyMAik7QJSfo6TrM1LFcr7zoyN/O/VtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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