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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861393be36a5bb21f3faa3dfa48f8dedf5d8812e773b9796d8683651b76355bc' 
  AND token = '3akMEBKQTIHq5qs5JE2d4m86QRJ5InoMzgaM1pMa1Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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