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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809fd9ac7f7719bf8a75f6baaa3b9dd6544e4f412ccf37089a3246e937d356dd' 
  AND token = 'dMH9zoCm+0zL8u/lHO5u5yTcPEQUdyNT5BhD2n9sTwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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