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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b675439d1aac8111322dd6660c62f2c4b4c9158ca9ec0f6fc56fa4c8bcd64c' 
  AND token = 'hmUyNAWH7fbMNjx6hW4Z/FyGdMitdOoYs15xOJTfQjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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