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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509b447ab02542eca36039667309a317343802afa7aa4378b3a69b2449218191' 
  AND token = '0mlANze5CJ+SdHqByZY5b1DMeMTb5szfH2MIr+riVbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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