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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902c4c80e179a881a3552ef44dd359aad881cc58443ca857a0ba48efd5636328' 
  AND token = '6KPZrWPvEs9tdRPH89hIZpNDwqcu+tdWKtU7nepwjwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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