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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0bd94b51fd02bd6895aecbbadec551c1240cfc633dfce389c4ae0f40bf4f17' 
  AND token = 'o79BynpOoz/gMAHMNG4fH+B6QlLzqXBO7rd3K3E4d9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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