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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb367b07721366ce9e7ce2724ee0336be91a9f98945bca404969211ae18c2303' 
  AND token = 'Z0zPtPX5vMnBf5Rg0OGIec0YCQLKc5ko/9HvGQK/clE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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