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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ee15afa39339a3845df74d808ca5583c9697916a4bdf532d8b552621cabd4f' 
  AND token = 'V9v82OMU5ZjSyvJuDegE5rmLUdTQN3sn/HapH9B5MMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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