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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c472e4646607a2e7b31181f9ef8f0c16649b4f506c6e72870b702b81ffd094' 
  AND token = 'Lwwya1Hq5ia8iMgN+DM45nuhjN5s57VqoeBX6QTW0A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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