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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbd9c1bcb5a9ce50f1629973674655b9436a65a6bd4533239c3b06cd295dcc6' 
  AND token = '9uUO/3GWcwsitmgPRgsC1iyCu/qaaH00QtsRnD2OMLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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