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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ac7b4f44d21cfc2a58cb1965d7fdc08c6df39dfef4bbb35bb927af972142f7' 
  AND token = 'twn1/m0L1dXeP3Nfi4132JsN6SPKfgcu7e7kJ5bZGWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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