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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd430d1e06827386792e92b16d1a09fa34b7a7f0f632db79be7f9f4966e199f75' 
  AND token = 'DelwGkVIDACyJuPA8garQd7N7Rdr/duweECPufeobYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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