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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e1158004a8e2631d3bc1979a08dec2e826c18ab481caf08483637c0e7c8dfc' 
  AND token = '67ZBU7zK1ZcIWy27quwig7g1HQBbbNuw6qApkA6M2jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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