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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3839dd4ecdd0de3b23ea3429f905e459b3cff70a7e5977abc0a55ba67003e16b' 
  AND token = 'YPIc4r12b+8Xub2sf8UFgmzFa1hNlU8vdZmgkw1Om8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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