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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b74b00c619caa20d002cd84ac488f130459dcd614485f978d4798c2926a5ce4' 
  AND token = 'QlIxQ+9FcoGmyz0TgO2d9Qgpr6UwBjghdf0t2iO0q9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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