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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59170fa081c7c8d0939091d42b7c73db5c865d00de662146676f276b84af9fb4' 
  AND token = 'IMDwrJYzAH62nsLWjfO9uqvuAbvACbzT/S2CcVoUb9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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