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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b5f29f415e15b4427e72a1b14e389ace1839d1e840b41e4d36580b2c8304f' 
  AND token = 'E1+BJU+OG/jTWzoezTzYp+Z79RAkSOqt0SigyGbU2Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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