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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608179b71b1f762e81658d2b92e83d0056a6932402bb52c6d3a1b176c593fed3' 
  AND token = 'ZAnvO/2wE44HaKkKJrr2vBZb0nxTyy7jWCtLbWgu94A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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