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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34999e083db1683f8422d35cb529387d38c8375deda2e9c2b0eae18fdc988ea' 
  AND token = '4q8RPs2H6uROVunqz+bZemIL6wEAJOU3ORa/kdnsxqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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