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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db060650588ca57ac7c8396e46aab45d0268bf8fc3cfe78c29caab708296260c' 
  AND token = 'iekpn2mdJfXmbE0ZpK6/YyBhRI/F7QskQKkvLDsuebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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