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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5028adba5249ea63362bd24a8fc33735c0edff21b00872c8125d5eb9f11d7817' 
  AND token = 'LXETY7ElZC1tQQdTuEtJIJuk0RW0zd/00K5Us1bGx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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